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The other two wires on the clutch switch are cruise control disable.

Take it easy on the timing with 87 octane. I just tuned a 1500 hd 4wd truck and only put 20* at WOT. It had a stage 1 cam and I was hitting .80 g/s. The stock timing table falls off a cliff and only...

I finally fixed the issue. It was definitely the injector duty cycle spikes just drowning the engine with fuel. Turns out I really screwed up the transient fueling trying to tune out a stumble. Then...

So I just tried this tune to see if these OL settings would help. It still did the same thing with startup, but once it went through all of this messed up startup stuff it was snappier. So I think we...

Thank you for your replies. I didn?t have my wideband hooked up when I took the logs. It did read off the charts lean when I was trying to start it, but then I was wondering if it could?ve just been...

No adapters. I have rectangle port heads on it. I've added about 50% more fuel in the open loop table at the colder temps and it didn't make any difference. I went 50% leaner too and no difference....

So studying the datalog when the rpm's drop after the initial startup, the injector duty cycle drops and the vehicle slowly dies. Even when it does start and stay running the injector pulse width...

Correct. Just on the supply side. I have a Walbro 450 and a DW2000 fuel pressure regulator. The return side of the fuel pressure regulator shouldn't be bleeding back. But I haven't put a pressure...

It does not matter if I cycle the key a few times. I actually just installed a check valve in the feed line to make sure it held pressure and that had no effect. I've been battling this for over a...

So when I first key on without starting the car, the MAP reads 0.0 on my scanner. It doesn't refresh on the scanner until I start the car. I find this strange. Maybe it's something with the 2bar map...

According to the Deatschwerks injector data for this injector, it flows 85.4 lb/hr at 58psi. I used the hpt injector calculator and it spit out 73.96 for 43.5psi.

It is odd with the map sensor...

So my own LS swap is kicking my butt on cold starts. It is a 6.0 LQ4 with an LSA blower. I have Deatschwerks 65lb injectors that I lowered the flow rate data for 43psi fuel pressure, but the same...

I ran into the exact same issue with SEP 1000s. I had to lower the fuel pressure to even get them to spray. But we still had wildly inconsistent afr readings at low pulse widths. We ditched the SEP...

I had a similar issue with the same injectors. I had to lower the fuel pressure to 43 to even get it to spray fuel on a hot restart. I?m not a huge fan of them but the price point is usually too good...

Does the truck still have cats? If so your cats could be restricted and causing these issues. It would explain the lower airflow and it?ll cause knock.

Never mind. I cleared out all of the channels and reloaded them. Now the manifold absolute pressure reads correctly. Weird deal and I can’t explain it. But it worked.
Thanks for all the help.

That’s what I was expecting to see also. Do you have to pick a specific 2 bar pid in the scanner channels?

So you guys are saying the scanner should just say the correct kpa if the ECM has the correct map data? I’m thinking the ECM is doing what it should since it just goes off of voltage of the map. I...

Well I have the map sensor linear at 200, Linear B at 66.66, and offset at 10.33.
Usually when I log a map sensor that isn’t the factory 1bar I have to pick “manifold pressure sensor 2bar” in the...

I'm trying to tune a 2005 vette with an e40. I might be missing something, but there is no choice for a 2bar map sensor in the channel list to log. It has the cobalt ss 2bar sensor and the tune is...

Are you running 100% gasoline? Or 10% ethanol? If it's 10% then you should tune for a stoich of 14.1. Your wideband will still read 14.7 if on gas scale. Thats why it's a good idea to tune with...

Are you talking about the "hi rpm disable" under the dynamic airflow tab? If so setting that to 8000 will keep you in blended sx/maf all of the time. You need to change the "maf fail high" to 0hz...

I got it figured out. I didn't switch the afm to disabled. I guess the injectors were only firing on 4 cylinders.

I'm trying to tune a 2012 silverado with a 5.3 and ls9 cam swap. The thing is an absolute dog and the fuel trims add up to 60%. I've tried to disable dynamic fueling so it just runs off of the maf....

I suspect wiring error. The TPS voltage should go from 0 -> 5v. I think you may have the 5v ref and the low ref wires crossed.